Lathe



(No Model.) 9. Sheets-Sheet l.

P. P5' C. M. KUHN. GRINDING LATE-E.

No. 575,250.4 Paten-ted Jam.l 12, 1897.'

TH: Nonms Pun c` (No Modem P' 8E 2 ShGStS-Sheet GBINDING LATHE.

Patented Jan. 12, 1897.

llNiTED STATES PATENT OEEicE.

FRANK P. KUHN AND CHARLES M. KUHN, OF KEARNEY, NEBRASKA, ASSIGNORS OFONE-HALF TO JOSEPH H. BLACK dt SONS, OF SAME PLACE.

GRINDlNG-LATHE.

SPECIFICATION forming part of Letters Patent No. 57'5,250, dated January12, 1897.

Application filed January 13, 1896. Serial No. 575,313. (No modelo Toall whom t may concern.-

Be it known that we, FRANK P. KUHN and CHARLES M. KUHN, of Kearney, inthe county of Buffalo and State of Nebraska, have invented a new andImproved GrindingLathe, of which the following is a full, clear, andexact description.

Our invention relates to machines adapted for grinding the sickles orblades of lawnmowers, harvesters, or reapers, or the sickles or bladesof other machines.

The object of the invention is to simplify the construction of suchmachines, and especially to provide a means for adjusting the stone tothe blades from the front of the inachine instead of from the back orfrom the sides, and, furthermore, to provide fingers or guides assupports for the blades to the ground, and to so form these supports orguides that they may be adjusted to admit of the proper grinding ofdifferent shapes of blades to different angles, and whereby, fnrther,when the different guides or fingers are adjusted they will remain intheir adjusted position.

Another object of the invention is to provide the guides or fingers withadjustable shoes with which the blades comeV in direct contact, the shoeof the lower finger or guide being adapted as a support for the bladeand the shoe of the upper finger or guide being adapted to prevent theblade from iiying upward when in contact or in engagement with thegrindstone.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, formingapart ofthis specification, in which similar characters of reference indicatecorresponding parts in all the gures.

Figure 1 is aplan view of the machine. Fig. 2 is a detail frontelevation of the shoe of the upper linger or guide. Fig. 3 is a sideelevation of the aforesaid shoe and its support and a portion of theupperfinger or guide, to which the support is attached. Fig. 4 is alongitudinal vertical section taken substantially on the line 4 4 ofFig. 1; and Fig. 5 is a detail longitudinal section on the line 5 5 ofFig. 1, illustrating the manner in which the guides or fingers arevertically adjustable. Fig. 6 is a detail section illustrating the meansfor adjusting one of the shoes.

In carrying out the invention a table A is supported upon a suitablebase 10, and in the said table, at each side of the center, alongitudinal opening llis made, as shown in Figs. y

1 and 4. The drivefshaft 12 maybe mounted upon the base 10, and two arms13 are loosely mounted upon the said driveshaft, which arms extendupward, one through each slot 11, to a point above the table at therear, and each arm at its upper end is provided with a box or bearing14, in which boxes or bearings the arbor 15 of the grindstone 16 ismounted to revolve.

A bow or yoke arm 17 ,has its members loosely mounted on the boxing ofthe arbor of the stone, one at each side thereof, as shown in Fig. 1,and the said bow or yoke arm extends rearwardly a predetermineddistance. This arm is given vertical adjustment, that is to say, it maybe raised or lowered, preferably, through the medium of a worm-wheel 18,which is fast upon one side of the arm, the said wheel being looselymounted on the stone-arbor 15 and is engaged by a worm 19 on a shaft 20,journaled in suitable bearings in one of the boxes 14, and said shaft isprovided with a cap 21, preferably serrated at its periphery, in orderthat it may be readily turned with the fingers.

Two guides or fingers 22 and 23 are employed in connection with thestone, and these guides or fingers are semicircular, one being locatedabove the stone and the other below it. A suitable space is made tointervene the inner faces of the lingers or guides and the periphery ofthe stone, and the iingers or guides are connected at the rear of thestone, but a space intervenes their forward or free ends. The twofingers or guides are pivoted by the same pivot-pin 24 upon the rearportion of the bow-arm 17, each of the guides or fingers being providedwith a bracket 25 to straddle the said bow-arm, as shown in Fig. 1. Theupper arm 22 is permanently fastened to the bow-arm by means of a set-IOO screw 26, which is usually passed through an elongated slot formedin a rear extension 22a of the upper finger or guide and into the bowarm17, it being understood that the pivotpin 24 is primarily intended forpivotally connecting the two fingers or guides.

The lower finger or guide 23 is adjustable to and from the stone, and tothat end it is preferably provided with a downwardly and rearwardlyprojecting extension 23a, and an ad justin g-screw 27 is passed throughthe opening in this extension and into a correspondingly-threadedopening in the rear end ofthe bow-arm 17, as is clearly shown in Fig. 4.

Each guide or finger at its forward end is provided with asupporting-plate 28 and a shoe 32, carried thereby, the plate and shoeof the upper finger or guide extendin g downward tangentially to theperiphery of the stone, and the corresponding parts of the lower fingeror guide extend upward tangentially to the periphery of the stone. Bothsupporting-plates and shoes are adjusted upon and connected alike withthe upper and the lower guides or fingers. rlhis connection is bestshown in Figs. 2, 3, and 4, in which it will be observed that the supporting-plate 28 is pivoted in ears 23?, formed upon the arm to whichthe plate is to be attached; and ears 29 are formed at each side of theouter face of the supporting-plate 28, having openings to receive thethreaded stem of an adjustingscrew 30, and the said screw is preferablyprovided with a milled head 31, in order that it may be readily turned.

The shoe 32 is pivoted upon the lower front portion of thesupporting-plate by means of a screw 33 or its equivalent, and the edgeof the shoe adjacent to the stone is somewhat segmental and is beveledin direct-ion of the stone, as shown at 32a in Figs. 2 and 3. The shoeis provided with a central extension 34 at what may be termed its outerend, the extension having an opening receiving a nut 30, which ispivotally and slidably mounted in the opening and through which theadjusting-screw 30 passes, so that by manipulating the screw 30 the shoeis adjusted sidewise or horizontally with respect to the axis of thegrinding-Wheel.

The shoes are given vertical adjustment to and from the periphery of thegrinding-stone through the medium of a screw 35, which has bearing uponthe arm to which the supporting-plate is pivoted and passes through athreaded opening in the said plate, being provided, preferably, with amilled head 36 at its outer or forward end. It will th us be observedthat all of the adjustments, with possibly the adjustment of the guidesor fingers relative to the stone, are made from the front of themachine.

At or about .the central portion of the machine, near the front, apillar 37 is secured, provided with an opening through which a sleeve 38is passed. rlhe said sleeve is pivoted in the opening of the pillar bymeans of a fixed stud 37 at one side and an adjustable stud 37 b attheopposite side. The sleeve 38 constitutes a guide for an adjusting-shaft40, which is provided with a threaded rear end 41, the said threaded endbeing passed through a threaded opening at the central portion of aconnecting-rod 42, uniting the two supporting-arms 13 for thegrindstone, and at the outer or forward end of the shaft 40 preferably amilled head 43 is secured, in order that the said shaft 40 may be turnedreadily from the front of the machine and the supporting-arms 13 of thegrindstone be carried toward the front or toward the rear of the table,as the character of the work may demand. The shaft is prevented fromhaving end movement in the sleeve by securing collars 39 on the shaft ateach end of the sleeve, as shown in Fig. 4.

A belt 44 is usually passed over the pulley 45 on the drive-shaft andover a smaller pulley located on the arbor of the grindstone, as shownin Figs. 1 and 4. A bench-bracket 46 is secured transversely on the topof the table A in front of the opening 11 therein, and this bracketissomewhat V- shaped in cross-section, and has horizontal side flanges,as shown in Fig. 4, the said side flanges having a dovetail slideconnection with a bed 47, (shown in Figs. 1 and 4,) and the said bed isprovided with a central longitudinal rib or raised surface 4S, havingundercut sides, being adapted to constitute slideways for the base 4S oftwo center-posts 50, each of which is provided ordinarily with aninwardly-extending center-pin 51, and the said posts are held in theiradjusted position on the bed by means of a set-screw 49, the top ofwhich is preferably at the upper surface of the base portions of thecenter-posts. The lower ends of the screws pass through nuts located atthe under face of the raised section or rib 4S of the bed, asillustrated in Fig. 4.

Under this construction when the stone is moved to or from the operatorto accommodate it to different-sized mower-knives, or when the shoes ofthe fingers or guides are moved up or down or adj usted laterally toobtain the proper bevel at which the blades are to be ground after theadjustment is accomplished, the guides or fingers will remain in theiradjusted position as long as may be desired; and since the guides orfingers are arranged around the stone, and move forwardly or rearwardlywith the stone, the said guides or fingers will never be out of properrelation to the stone, and it is evident that even when the fingers orguides are adjusted vertically they will sustain the same relation tothe stone, since they simply move around it.

No wrench is required in connection with the machine, since all of itsadjustments may be readily made by hand.

The machine is adapted for other work than that of grinding the knivesof mowers and IOO IIO

like articles, as, for example, it may be advantageously used insharpening printers paper-cutters, iiuted reamers, skates, drills, orthe finger-plates of a common mower, as well as the sickle. The rightand left adjustment of the shoes enables the machine to be adapted toany spiral surface that may occur in the work.

Having thus described oui` invention, we claim as new and desire tosecure by Letters Patentl. The combination, with a grindstone, of guidesor fingers adjustable with reference to the said grindstone, one of theguides or iingers being adjustable to and from the stone, substantiallyas shown and described.

2. The combination, with a grindstone and its arbor, of a bifurcatedsupport loosely mounted on the boxing of the arbor at each side of thesaid stone, guides or fingers located one above and the other below thestone, conforming to the curvature of said stone, being carried by theaforesaid support, and means, substantially as described, for verticallyadjusting the said support, as and for the purpose set forth.

3. The combination, with a grindstone, its arbor and the bearingstherefor, of a support having a bifurcated end straddling the stone andloosely mounted on the boxing of the arbor thereof, segmental guides orfingers located one above and the other below the stone, the said guidesor fingers being carried by the bifurcated support, one of the saidlingers or guides being adjustable to or from the stone, and anadjusting mechanism connected with the said support, whereby the supportmay be raised and lowered and the fingers or guides may be adjustedaround the stone without changing their relative positions thereto, as

Y j and for the purpose set forth. 4o

a. The combination, with a grindstone, its arbor and a support therefor,of semicircular iingers orguides located one above and the other belowthe said stone, and. mounted 'to have adjustment around the stone, and ashoe located at the free end of each finger or guide, having adjustmentto and from the periphery of the stone, and in direction of the sides ofthe same, as and for the purpose specified.

5. The combination, with a grindstone, its arbor and the supportstherefor, of semicircular fingers or guides arranged one above and theother below the stone, being mounted to revolve around said stone, asupportingplate pivoted at the free end of each finger or guide, meansfor adjusting the said plates to and from the periphery of the stone,and

` shoes located upon the said supporting-plates,

being capable of side adjustment and having their edges adjacent to thestone 4curved and beveled, as and for the purpose set forth.

6. The combination, with a grindstone, of

guides partially encircling the said stone, ad-

justable to and from its periphery and capable of rotary movement aroundsaid periphery, and shoes carried by the free ends of the guides orfingers, having adjustment to and from the'periphery of the stone, andlikewise being capable of side adjustment, substantially as shown anddescribed.

, 7. In a machine for grinding sickles and other blades or cutters, thecombination, with a grindstone and guides or fingers partiallysurrounding the same, of a plate pivoted to the free end of each fingeror guide, the said plates extending in direction of each other and indirection of the periphery of the stone, adj listing-screws havingbearings on the said lingers and connected with the ends of the platesfarthest removed from said stone, av

shoe pivoted upon each ofthe plates', extending from the free ends ofthe plates in direction of the periphery of the stone, andadjusting-screws carried by theplates and connected with the shoes,whereby the latter may have side adjustment, as and for the purposespecified.

8. The combination with a frame having a work-holder thereon, of agrinding-wheel mounted on the frame, a yoke fixed adjacent to andembracing the grinding-wheel and two curved fingers pivoted on the yokeand capable of adjustment with relation to the grinding-wheel,substantially as described.

9. The combination with aframe having a work-holder thereon, of agrindingwheel mounted on the frame, a yoke held on the support of thegrinding-wheel and embracing the grinding-wheel, and two curved fingerscarried by the yoke and extending around the grinding-wheel, the fingersbeing adjustable with relation to the grinding-wheel, substantially asdescribed.

10. The combination with a frame having a work-holder, of agrinding-wheel mounted on the frame, a curved finger pivotally mountedadjacent to the wheel, and an adjustable screw carried. bythe finger,substantially as described.

1l. The combination with a frame having a work-holder, of apivotally-mounted arm cariied by the frame, a grinding-wheel mounted onthe arm, means for movingthe arm, a yoke carried by the arm, and acurved finger pivotally connected to the yoke and capable of adjustmentwith relation to the grindingwheel, substantially as described.

FRANK P. KUHN. CHARLES M. KUHN'. Witnesses i O. P. PEARsoN, P. F. SMEAD.

IOO

